Commit b65780e1 authored by Jan Beulich's avatar Jan Beulich Committed by Andi Kleen
Browse files

[PATCH] unwinder: move .eh_frame to RODATA 



The .eh_frame section contents is never written to, so it can as well
benefit from CONFIG_DEBUG_RODATA.

Diff-ed against firstfloor tree.

Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent c65f38d9

arch/i386/kernel/vmlinux.lds.S

+0 −9
Original line number Diff line number Diff line
@@ -102,15 +102,6 @@ SECTIONS 
	_edata = .;		/* End of data section */

  }



#ifdef CONFIG_STACK_UNWIND

  . = ALIGN(4);

  .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) {

	__start_unwind = .;

  	*(.eh_frame)

	__end_unwind = .;

  }

#endif



  . = ALIGN(THREAD_SIZE);	/* init_task */

  .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {

	*(.data.init_task)

arch/x86_64/kernel/vmlinux.lds.S

+0 −9
Original line number Diff line number Diff line
@@ -51,15 +51,6 @@ SECTIONS 


  RODATA



#ifdef CONFIG_STACK_UNWIND

  . = ALIGN(8);

  .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) {

	__start_unwind = .;

  	*(.eh_frame)

	__end_unwind = .;

  }

#endif



  . = ALIGN(PAGE_SIZE);        /* Align data segment to page size boundary */

				/* Data */

  .data : AT(ADDR(.data) - LOAD_OFFSET) {

include/asm-generic/vmlinux.lds.h

+12 −5
Original line number Diff line number Diff line
@@ -119,8 +119,7 @@ 
		*(__ksymtab_strings)					\

	}								\

									\

	/* Unwind data binary search table */				\

	EH_FRAME_HDR							\

	EH_FRAME							\

									\

	/* Built-in module parameters. */				\

	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
@@ -162,15 +161,23 @@ 
		VMLINUX_SYMBOL(__kprobes_text_end) = .;



#ifdef CONFIG_STACK_UNWIND

		/* Unwind data binary search table */

#define EH_FRAME_HDR							\

#define EH_FRAME							\

		/* Unwind data binary search table */			\

		. = ALIGN(8);						\

        	.eh_frame_hdr : AT(ADDR(.eh_frame_hdr) - LOAD_OFFSET) {	\

			VMLINUX_SYMBOL(__start_unwind_hdr) = .;		\

			*(.eh_frame_hdr)				\

			VMLINUX_SYMBOL(__end_unwind_hdr) = .;		\

		}							\

		/* Unwind data */					\

		. = ALIGN(8);						\

		.eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) {		\

			VMLINUX_SYMBOL(__start_unwind) = .;		\

		  	*(.eh_frame)					\

			VMLINUX_SYMBOL(__end_unwind) = .;		\

		}

#else

#define EH_FRAME_HDR

#define EH_FRAME

#endif



		/* DWARF debug sections.

kernel/unwind.c

+1 −1
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 
#include <asm/uaccess.h>

#include <asm/unaligned.h>



extern char __start_unwind[], __end_unwind[];

extern const char __start_unwind[], __end_unwind[];

extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];



#define MAX_STACK_DEPTH 8